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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D3 CAT DOZER

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KNN

10-23-2006 15:25:29




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I HAVE A D3 CAT DOZER AND HYDRAULIC OIL FROM
THE TRANS IS MIXING IN MY ENIGINE OIL
HOW DOES IT GET THERE? ANY HELP PLEASE




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Bob Plumadore

10-25-2006 04:33:49




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 Re: D3 CAT DOZER in reply to KNN, 10-23-2006 15:25:29  
The dozer engine is a lot easier to get out than the 931 loader's. Nobody mentiond the fact that you have to have a special installer to put the seal in. you would be ahead to give one of the sevice guys a $100.00 to stop by and put it on.



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135 Fan

10-25-2006 12:55:07




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 Re: D3 CAT DOZER in reply to Bob Plumadore, 10-25-2006 04:33:49  
The shop did my engine. They said 931's are one of the worst for pulling the engine. They specialize in Cat and did it in 6 hours. Of course the bozo at Finning said he could do it in less than 4 hours. I should have made him a bet he couldn't do it that fast. The tranny mounts have to come right off to have enough clearance. Hopefully it will stay in for 10 000 hours or so. Dave



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murray

10-24-2006 06:19:58




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 Re: D3 CAT DOZER in reply to KNN, 10-23-2006 15:25:29  
Are you sure its from the trans or from the hydraulic system. The Hydraulic pump is on the left side of the engine and if the seal went bad in it it would go in the oil. If not that then I would say it must be the rear seal. We put a new motor in our D3 and we didn't have to pull the trans. Not really that bad of a job. It looks much worse than it is but once you take off the front with the radiator and the dash everything is actually quite easy to get too. We put a engine in our D3 and it was a bad engine (somehow Cat messed up and put in the wrong pistons) and I took it back out in about 3 hours. But everything was easy to take apart because I had just put it together.

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murray

10-24-2006 06:29:54




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 Re: D3 CAT DOZER in reply to murray, 10-24-2006 06:19:58  
Oh I forgot the rear seal is easy to get to (at least on ours it was). You just have to pull off the flywheel and it is right there. I believe that all you would need would be the seal. I cant think of any gaskets that you would need to take apart. The trans and engine gasket is a big O ring. Unless you have to take off the rear bell-
housing too get the seal out then you would need that gasket. Still not all that bad a job.

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135 Fan

10-23-2006 17:25:59




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 Re: D3 CAT DOZER in reply to KNN, 10-23-2006 15:25:29  
Unfortunatly it sounds like the rear seal on the engine is leaking. The engine and trans probably need to come out as one unit. It did on my 931B [D3B] because there isn't enough room to unbolt the tranny. The only good news is that Cat has pretty good manuals with pictures how to do it. I had to use a skid steer loader and an engine crane to pull mine. It was in the field in the middle of winter. I put a portable shelter around it with a heater and lights run from a generator. I put it back in and after getting it pulled out of the mud had to pull it again. I got all of 16.5 hours out of it! A couple gear teeth sheared off the oil pump drive. It was warrantee but still sucked. Then the rings didn't seat and it had to come out again. I got a good deal and paid to haul it to the shop that rebuilt it and had them pull it. They said it would have cost around $3000 to have them pull it in the field originally. At least you can move your machine to a more ideal place to do it. Do some other checks and make sure though before you pull it. It's takes a while but is pretty straight forward. The engine and tranny weigh around 1600lbs. Dave

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Bob/Ont

10-24-2006 07:20:20




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 Re: D3 CAT DOZER in reply to 135 Fan, 10-23-2006 17:25:59  
Have to put the front cover on carefully and turn the oil pump as you do to get the gear teeth in mesh or they will shear off.
Later Bob



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135 Fan

10-24-2006 10:41:40




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 Re: D3 CAT DOZER in reply to Bob/Ont, 10-24-2006 07:20:20  
My machine is a B model with loader. D3s must have have easier access. The hydraulic pump could be leaking. Also check if it might be diesel? If the rear seal is leaking it might transfer fluid the other way because the engine might have a slight pressure and the trans has a vent to relieve pressure. When my engine came out the second time, two teeth were sheared off the oil pump and about four were shaved off. I had a reputable shop do it but they used the old oil pump because it was like new. Now they always replace them. They said they have never seen one break before. Maybe they slipped up? Dave

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KNN

10-24-2006 13:43:59




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 Re: D3 CAT DOZER in reply to 135 Fan, 10-24-2006 10:41:40  
I HAVE TO ADD FLUID TO THE TRANS EVERY DAY
AND I CAN CHANGE OIL IN THE ENGINE RUN ABOUT
ONE HOUR BE ABOUT A GALLON TO MUCH OIL IN
ENGINE. ALSO PUT DYE IN TRANS IT SHOWED IN ENGINE
OIL. THANKS FOR INFO



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Bob/Ont

10-24-2006 14:14:22




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 Re: D3 CAT DOZER in reply to KNN, 10-24-2006 13:43:59  
You need to change the rear crank seal but also take a good look at the torque converter and make sure it isn't coming unbolter or cracked. Something is splashing a lot of oil around there.
Later Bob



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murray

10-24-2006 11:11:04




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 Re: D3 CAT DOZER in reply to 135 Fan, 10-24-2006 10:41:40  
Dave even Cat can screw up. The engine we got was factory rebuilt and the pistons hit the valves. They replaced the engine with a new one (rebuilt) and gave us new gaskets for the ones that we had already bought and installed on the bad engine. But we had to ask for the gaskets to get them and they didn't offer to pay for any of my time or gas money for the 2 220 mile round trips to exchange it.

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135 Fan

10-24-2006 22:00:16




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 Re: D3 CAT DOZER in reply to murray, 10-24-2006 11:11:04  
I don't feel so bad saving money instead of going to Finning. I'm in Edmonton and Finnings [worlds biggest cat dealer] head office is here. They don't really care about you too much if you only have 1 or 2 machines. Some of the service guys are OK, some act like nobody else knows anything. I have 3 ring pistons in mine that Cat doesn't have. Actually finning doesn't even have a service counter! If you happen to find one of the ladies in front, they page them. It's usually very hard to get someone in service to answer the phone. The best thing about Cat is that parts are available for almost any machine ever made. Very pricey though. Bottom Rad mounts $115! Each! and you can't get aftermarket. Thanks Murray for making me feel better. Some people said I should have went to Cat. Dave

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